My commentary says ἐν οἷς is picked up by ταῦτα. The semantics of this are extremely obscure to me. As is the grammar. Can anybody explain what is going on here grammatically then semantically?
Thanks in advance.

Hi there! I'm not quite sure what "picked" means here to tell you the truth. Maybe that they are linked and that "ταυτα", although second, is what determines the gender of "εν οις" (which is plural by the way ).
A bit like " I will guard it with my life because my watch is precious", vs "I will guard her with my life because my daughter is precious". Clunkiness aside, I hope you get what I mean: It's the second word of the pair that I have in mind when referring to it by pronoun the first time.

Anyway, it's "ταυτα (τα πράγματα) εν οις ευδοκιμουσιν".
"These things in which they blah blah blah blah blah, those are the ones blah blah blah blah" format. "These things they fare well in (they gain from), (those) are the ones they care for".
Similar to "These things they X, those are the ones they care for" ( "those" is obviously not necessary unless the intervening blahblah goes on like an ancient -or modern- Greek )

They care for/guard these things in which they stand to gain (poor English!)

OK, I have a new question about this passage. What is going on at the very beginning? Why is ἐστὶν present at all? And why is it singular? ἀφῖκται seems to be the verb. So why do we need ἐστὶν? Can somebody spoon feed this to me?

pster wrote:OK, I have a new question about this passage. What is going on at the very beginning? Why is ἐστὶν present at all? And why is it singular? ἀφῖκται seems to be the verb. So why do we need ἐστὶν? Can somebody spoon feed this to me?

The subject of ἀφῖκται is τὰ πράγματα; that of ἐστὶν is πολλὰ αἴτια, in the sense of existence,
"there are many reasons/causes for these..."

In both, it is singular because a neuter pl. subject takes a sg. verb.